I doubt that a new hardware installation would cause your Norton protection to malfunction. It might be because of the drivers/software that came with the sound card that interfered with the Norton Auto Protect feature. Try uninstalling all of the software but leave the actual hardware in your computer. If you still have the problem, try removing the hardware and seeing if the Auto Protect Feature works. Maybe it could be the hardware, I'm not sure. I hope this helped.
Yup, had the same problem, my Norton would not enable me to load certain programmes, and this was after a clean install. Got onto Norton, an they said the only fix was to un-install, then re-install - tried it and it worked a treat.
EP, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS